A threat looms on the sun-splashed horizon of the Republic of the Marshall Islands. The specter of climate change wraps its fingers around the islands, raising sea levels, salinizing soils, and sapping freshwater resources. These changes will make it even harder to sustain crops, which could push the population to even greater reliance on processed foods, which has already spurred a diabetes epidemic on the islands. The major role played by the United States in the history of the Marshalls, where nuclear bombs were famously tested during the Cold War, may continue, as the impacts of another existential threat—climate change—continue to increase.

In 1970, Cyclone Bhola slammed into East Pakistan – present day Bangladesh – with sustained winds of 150 miles per hour, killing as many as half a million people. In 2007, Cyclone Sidr killed 3,406 people in Bangladesh. This year, Cyclone Roanu killed just 30. What’s behind this huge decline in mortality? What has Bangladesh done differently?